[Cmake] multiple compile of an object

[Ken Weinert]

OK, I thought I had this one solved, but it turns out that it isn't
quite right.

My situation is this: 

	I frequently write a little test program into my class
definitions. That is, at the end of the file where all the methods
have been defined you'll find something like this: 

	#if defined(<CLASSNAME>_MAIN_NEEDED)
	int main()
	{
		// test code goes here
	}
	#endif

	And then I'll compile a small standalone test program and also
compile the .o to be included in the main program.

	Is there a way to automate this in CMake? If so, a pointer to
where it might be documented (or an idea of how to do it) would be
appreciated. 

	Thank you.

-- 
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